32640321 has 12 divisors (see below), whose sum is σ = 50626032. Its totient is φ = 18651528.

The previous prime is 32640319. The next prime is 32640343. The reversal of 32640321 is 12304623.

It is a happy number.

It is not a de Polignac number, because 32640321 - 2¹ = 32640319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (32640301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110875 + ... + 111168.

It is an arithmetic number, because the mean of its divisors is an integer number (4218836).

Almost surely, 2^32640321 is an apocalyptic number.

It is an amenable number.

32640321 is a deficient number, since it is larger than the sum of its proper divisors (17985711).

32640321 is a wasteful number, since it uses less digits than its factorization.

32640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222060 (or 222053 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 32640321 is about 5713.1708358844. The cubic root of 32640321 is about 319.5838372666.

Adding to 32640321 its reverse (12304623), we get a palindrome (44944944).

The spelling of 32640321 in words is "thirty-two million, six hundred forty thousand, three hundred twenty-one".